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diff --git a/src/devices/bus/electron/mc68k.h b/src/devices/bus/electron/mc68k.h
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ Electron 68000 Expansion
+
+**********************************************************************/
+
+#ifndef MAME_BUS_ELECTRON_MC68K_H
+#define MAME_BUS_ELECTRON_MC68K_H
+
+#pragma once
+
+#include "exp.h"
+#include "cpu/m68000/m68000.h"
+#include "machine/6821pia.h"
+#include "machine/ram.h"
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class electron_mc68k_device:
+ public device_t,
+ public device_electron_expansion_interface
+{
+public:
+ // construction/destruction
+ electron_mc68k_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override ATTR_COLD;
+ virtual void device_reset() override ATTR_COLD;
+
+ // optional information overrides
+ virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
+ virtual const tiny_rom_entry *device_rom_region() const override ATTR_COLD;
+
+ virtual u8 expbus_r(offs_t offset) override;
+ virtual void expbus_w(offs_t offset, u8 data) override;
+
+private:
+ required_device<m68000_base_device> m_maincpu;
+ required_device<ram_device> m_ram;
+ required_device_array<pia6821_device, 2> m_pia;
+ required_memory_region m_boot_rom;
+ required_memory_region m_exp_rom;
+
+ memory_passthrough_handler m_rom_shadow_tap;
+
+ void mem_map(address_map &map) ATTR_COLD;
+
+ u8 m_romsel;
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(ELECTRON_MC68K, electron_mc68k_device)
+
+#endif // MAME_BUS_ELECTRON_MC68K_H